So, does this mean this is not considered to be a bug? It makes using the histogram impossible when you are doing a raw conversion, and this cannot be considered acceptable.
Other applications such as Capture One and PS do not have the same issue.

I thought this was a bug with the histogram???
If I open a raw file (I shoot DNGs) with any other app and compare the histogram with the Affinity one, Affinity is squeezed toward the shadows and or highlights. If I then make an adjustment and develop then re-enter the raw persona the histogram looks as I would expect.